TITLE: GCN CIRCULAR NUMBER: 33866 SUBJECT: Fermi trigger No 706610076: Global MASTER-Net observations report DATE: 23/05/24 11:00:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230524.36 (trigger No 706610076,00h 52m 19.20s , -87d 46m 12.0s, R=4.46) errorbox 1734 sec after notice time and 1767 sec after trigger time at 2023-05-24 09:03:59 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 58 deg. The sun altitude is -28.7 deg. The galactic latitude b = -30 deg., longitude l = 303 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2218977 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1858 | 2023-05-24 09:03:59 | MASTER-OAFA | (00h 58m 40.27s , -88d 01m 24.9s) | C | 180 | 17.7 | 2057 | 2023-05-24 09:07:18 | MASTER-OAFA | (00h 59m 12.93s , -88d 02m 52.5s) | C | 180 | 18.0 | 2237 | 2023-05-24 09:07:18 | MASTER-OAFA | (00h 59m 13.01s , -88d 02m 52.5s) | C | 540 | 18.5 | Coadd 2256 | 2023-05-24 09:10:37 | MASTER-OAFA | (00h 59m 27.79s , -88d 00m 55.7s) | C | 180 | 18.1 | 2456 | 2023-05-24 09:13:57 | MASTER-OAFA | (00h 59m 44.40s , -88d 01m 40.0s) | C | 180 | 18.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.